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arXiv · 2502.11406

Flavor dependence of Energy-energy correlators

Liliana Apolinário·Raghav Kunnawalkam Elayavalli·Nuno Olavo Madureira·Jun-Xing Sheng·Xin-Nian Wang·Zhong Yang
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Abstract

Energy-energy correlators (EECs) within high energy jets serve as a key experimentally accessible quantity to probe the scale and structure of the quark-gluon plasma (QGP) in relativistic heavy-ion collisions. The CMS Collaboration's first measurement of the modification to the EEC within single inclusive jets in Pb+Pb collisions relative to p+p collisions reveals a significant enhancement at small angles, which may arise from jet transverse momentum $p_T$ selection biases due to jet energy loss. We investigate the dependence of jet EECs on the flavor of the initiating parton. The EEC distribution of a gluon jet is broader and the peak of transition from perturbative to non-perturbative regime occurs at a larger angle than a quark jet. Such flavor dependence leads to the different EECs for $\gamma$-jets and single inclusive jets due to their different flavor composition. It is also responsible for a colliding energy dependence of EECs of single inclusive jets at fixed jet energy. We also investigate the impact of flavor composition variation on the $p_T$ dependence of the jet EEC. We further propose that a change in the gluon jet fraction in A+A collisions compared to p+p can also contribute to a non-negligible enhancement of the medium modified EEC at small angles. Using the \textsc{Jewel} model, we predict the reduction of the gluon jet fraction in A+A collisions and estimate its impact on the EEC.

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Liliana Apolinário, Raghav Kunnawalkam Elayavalli, Nuno Olavo Madureira, Jun-Xing Sheng, Xin-Nian Wang, Zhong Yang. 2025-02-17. Flavor dependence of Energy-energy correlators. https://arxiv.org/abs/2502.11406

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